Two-dimensional echo-Simpson's method

Two-dimensional echocardiographic images in the apical four-chamber (upper panel) and apical two-chamber (lower panel) views at end diastolic (left panel) and end systolic (right panel) phases. The left ventricular endocardial cavity is traced on each of these views and phases to calculate left ventricular ejection fraction using the biplane method of discs (modified Simpson's method).